4WD HI light only flashes, but 4WD works.

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12-28-2009, 03:30 PM

scrawford

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Thread Starter

Join Date: Dec 2009

Posts: 2

4WD HI light only flashes, but 4WD works.

I have a 2004 blazer. When i push the 4 HI button it flashes and never goes solid, but the 4WD works fine. When I push 2 HI it flashes for a moment then goes solid and the 4WD disengages fine. Shouldn't the 4 HI light go solid after a few moments? What's up with that?

Thanks for your help!

12-29-2009, 05:51 AM

FlatTopFoley

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Join Date: Oct 2007

Location: Maryland

Posts: 160

FlatTopFoley has a little shameless behavior in the past

from another thread

Quote:

Originally Posted by swartlkk

These flashing light issues are typically caused by encoder faults or a fault between the TCCM and the encoder causing the TCCM to revert back to the previously chosen mode. First check to make sure that the connection to the TCCM and to the encoder motor on the side of the transfer case are clean and corrosion free. If that checks out, then you may need to dig a bit deeper into the system.

For those with the NV233 transfer case (3-button dash switch), there are some pretty good threads in the Tech Article (DIY) section.

For those with the NV236 transfer case (4-button dash switch), you need a scan tool capable of accessing the TCCM to read the codes present for some direction.

https://blazerforum.com/forum/showth...lashing&page=2